For the record mine came with a 4 bar and still has a 4 bar... I'm an SUV anyway, not a truck.
Look around and you won't find any classes that still go by "stock suspension"... Nobody gives a shit about that anymore. They go by tire size... Drag radial, 275, 10.5, etc etc. That's what EVERYBODY goes by now a days... Tire size with limits on turbo size, how many stages, N/A, yada, yada. Whatever happened to just claiming you have a fast truck period
30' Ford Model A Tudor Sedan - Custom chassis - Big bore LS2 - twin B76's - Glide - 9" w/ 3.07 gears - 30" DR tire - 2k lbs cruiser